A strong cold front pushed into an unseasonably hot and humid airmass over south-central and southeast Wisconsin during the afternoon and evening, resulting in severe storms with damaging straight-line winds.  Temperatures ranged from the mid 80s across south central Wisconsin to near record highs in the lower 90s across southeast Wisconsin.  There were primarily two areas that were affected by severe thunderstorms.  A broken line of severe storms from Marquette to Dane County tracked east northeast into Dodge, Fond du Lac, Washington, and Sheboygan  counties.  This line produced damaging wind gusts from between 50 to 62 knots (58 mph to 71 mph).  Tree and power line damage was reported across many areas affected by this line of storms.  Another area affected by severe storms stretched from Rock county through Walworth, Waukesha, Milwaukee, and Ozaukee counties as one large supercell developed and tracked northeast along I-43.  Several reports of damaging winds estimated in excess of 70 knots (80 mph) were collected from portions of Waukesha county.  Widespread tree and power line damage was noted from Mukwonago through Brookfield.  More sporatic tree and power line damage was reported across northern Milwaukee and southern Ozaukee counties.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 13-SEP-05 17:00:00 to 13-SEP-05 17:00:00 (CST)
Location: SUSSEX
Magnitude: 61 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 13-SEP-05 17:04:00 to 13-SEP-05 17:04:00 (CST)
Location: PEWAUKEE
Magnitude: 61 EG
Reported by: GENERAL PUBLIC

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 13-SEP-05 16:40:00 to 13-SEP-05 17:00:00 (CST)
Location: MUKWONAGO
Magnitude: 58 MG
Reported by: LAW ENFORCEMENT

There were widespread reports of trees and powerlines toppled across Waukesha County.  Law enforcement reported a measured gust of 58 knots (67 mph) around the city of Waukesha.  Trained spotters estimated wind gusts of 70 to 74 knots (80 to 85 mph) embedded within the larger area of damaging winds between just south of Waukesha through Brookfield.

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 13-SEP-05 17:15:00 to 13-SEP-05 17:15:00 (CST)
Location: THIENSVILLE
Magnitude: 56 EG
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 13-SEP-05 17:18:00 to 13-SEP-05 17:20:00 (CST)
Location: CEDARBURG
Magnitude: 56 EG
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 13-SEP-05 16:52:00 to 13-SEP-05 16:52:00 (CST)
Location: DOUSMAN
Magnitude: 56 EG
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 13-SEP-05 17:22:00 to 13-SEP-05 17:22:00 (CST)
Location: SHEBOYGAN
Magnitude: 56 MG
Reported by: AWOS,ASOS,MESONET,ETC

Measured by the Fox TV-6 school network site at North High School.

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 13-SEP-05 17:00:00 to 13-SEP-05 17:15:00 (CST)
Location: WAUWATOSA
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Widespread large trees down. Measured peak gust on UW-Milwaukee campus.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 13-SEP-05 16:25:00 to 13-SEP-05 16:25:00 (CST)
Location: ELKHORN
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WALWORTH, WISCONSIN
From 13-SEP-05 16:35:00 to 13-SEP-05 16:35:00 (CST)
Location: WHITEWATER
Magnitude: 61 EG
Reported by: TRAINED SPOTTER

Powerful thunderstorm winds toppled a tree, which fell onto a car, injuring one person.

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 13-SEP-05 16:17:00 to 13-SEP-05 16:17:00 (CST)
Location: ENDEAVOR
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 13-SEP-05 16:08:00 to 13-SEP-05 16:08:00 (CST)
Location: MONTELLO
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 13-SEP-05 16:00:00 to 13-SEP-05 16:00:00 (CST)
Location: CAMBRIA
Magnitude: 56 EG
Property damage: 10K
Reported by: TRAINED SPOTTER

A one foot diameter tree fell onto a house, damaging the roof and attic.

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 13-SEP-05 17:50:00 to 13-SEP-05 17:50:00 (CST)
Location: WAUBEKA
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Trees blown over.

Thunderstorm Wind in ROCK, WISCONSIN
From 13-SEP-05 16:20:00 to 13-SEP-05 16:20:00 (CST)
Location: SHOPIERE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WALWORTH, WISCONSIN
From 13-SEP-05 16:30:00 to 13-SEP-05 16:30:00 (CST)
Location: DELAVAN
Magnitude: 61 EG
Reported by: FIRE DEPT/RESCUE SQUAD

Thunderstorm Wind in WASHINGTON, WISCONSIN
From 13-SEP-05 17:21:00 to 13-SEP-05 17:21:00 (CST)
Location: JACKSON
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

Large picnic table and chairs scattered and thrown 20 feet by wind gusts, and large trees down.

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 13-SEP-05 17:10:00 to 13-SEP-05 17:10:00 (CST)
Location: PLYMOUTH
Magnitude: 52 EG
Reported by: GENERAL PUBLIC

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 13-SEP-05 15:45:00 to 13-SEP-05 15:55:00 (CST)
Location: LODI
Magnitude: 56 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

Large trees and road signs down.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 13-SEP-05 15:55:00 to 13-SEP-05 15:55:00 (CST)
Location: PARDEEVILLE
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 13-SEP-05 16:40:00 to 13-SEP-05 16:40:00 (CST)
Location: PALMYRA
Magnitude: 52 EG
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 13-SEP-05 17:15:00 to 13-SEP-05 17:15:00 (CST)
Location: MILWAUKEE
Magnitude: 52 MG
Reported by: NWS EMPLOYEE(OFF DUTY)

Measured by the Fox TV-6 school network site at UW-Milwaukee.  Large tree branches down.

Thunderstorm Wind in DODGE, WISCONSIN
From 13-SEP-05 17:00:00 to 13-SEP-05 17:00:00 (CST)
Location: KEKOSKEE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 13-SEP-05 16:44:00 to 13-SEP-05 16:44:00 (CST)
Location: TAYCHEEDAH
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 13-SEP-05 16:25:00 to 13-SEP-05 16:25:00 (CST)
Location: WAUPUN
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DODGE, WISCONSIN
From 13-SEP-05 16:13:00 to 13-SEP-05 16:13:00 (CST)
Location: FOX LAKE
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 13-SEP-05 16:12:00 to 13-SEP-05 16:12:00 (CST)
Location: NESHKORO
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WASHINGTON, WISCONSIN
From 13-SEP-05 17:35:00 to 13-SEP-05 17:35:00 (CST)
Location: JACKSON
Magnitude: 50 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Large trees and power lines down.

Thunderstorm Wind in DANE, WISCONSIN
From 13-SEP-05 15:45:00 to 13-SEP-05 15:55:00 (CST)
Location: DANE
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WALWORTH, WISCONSIN
From 13-SEP-05 16:32:00 to 13-SEP-05 16:32:00 (CST)
Location: LA GRANGE
Magnitude: 56 EG
Property damage: .2K
Reported by: TRAINED SPOTTER

A tree fell onto a chicken house.

Thunderstorm Wind in WASHINGTON, WISCONSIN
From 13-SEP-05 17:35:00 to 13-SEP-05 17:35:00 (CST)
Location: JACKSON
Magnitude: 50 MG
Reported by: AWOS,ASOS,MESONET,ETC

Measured by the Fox TV-6 school network site at Kettle Moraine High School.

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 13-SEP-05 17:32:00 to 13-SEP-05 17:49:00 (CST)
Location: SHEBOYGAN
Magnitude: 56 EG
Property damage: 5K
Reported by: GENERAL PUBLIC

A barn door was blown off and items were blown out of the barn.

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 13-SEP-05 18:00:00 to 13-SEP-05 18:15:00 (CST)
Location: CEDAR GROVE
Magnitude: 56 EG
Property damage: 75K
Reported by: LAW ENFORCEMENT

Trees and power lines were blown down and a few houses sustained some minor damage.

Hail in DANE, WISCONSIN
From 13-SEP-05 15:45:00 to 13-SEP-05 15:55:00 (CST)
Location: DANE
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 13-SEP-05 17:23:00 to 13-SEP-05 17:23:00 (CST)
Location: PORT WASHINGTON
Magnitude: 56 EG
Reported by: GENERAL PUBLIC

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 13-SEP-05 17:10:00 to 13-SEP-05 17:10:00 (CST)
Location: MEQUON
Magnitude: 56 EG
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 13-SEP-05 15:55:00 to 13-SEP-05 15:55:00 (CST)
Location: WESTFIELD
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 13-SEP-05 17:10:00 to 13-SEP-05 17:10:00 (CST)
Location: HARTLAND
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WASHINGTON, WISCONSIN
From 13-SEP-05 16:45:00 to 13-SEP-05 16:45:00 (CST)
Location: KEWASKUM
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 13-SEP-05 16:33:00 to 13-SEP-05 16:33:00 (CST)
Location: ROSENDALE
Magnitude: 52 EG
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 13-SEP-05 16:35:00 to 13-SEP-05 16:35:00 (CST)
Location: FOND DU LAC CO ARPT
Magnitude: 52 MG
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in ROCK, WISCONSIN
From 13-SEP-05 16:25:00 to 13-SEP-05 16:25:00 (CST)
Location: JOHNSTOWN CENTER
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 13-SEP-05 16:20:00 to 13-SEP-05 16:20:00 (CST)
Location: GREEN LAKE
Magnitude: 62 MG
Reported by: EMERGENCY MANAGER